单品种撮合交易系统，撮合规则：价格优先，时间优先
1.orderid 保证唯一(生成规则: 64位整数, 高32位为当前时间,低32位为1秒内自增长字段)
2.ask_map 保证price越小排序越靠前，相同price越早入队报单排序越靠前
3.bid_map 保证price越大排序越靠前，相同price越早入队报单排序越靠前
4.order_map 采用hash_map存储，通过orderid 在O(1)时间内找到对应报单信息
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